/*
 * AM-callable functions for BRIN indexes
 *
 * Portions Copyright (c) 1996-2017, PostgreSQL Global Development Group
 * Portions Copyright (c) 1994, Regents of the University of California
 *
 * IDENTIFICATION
 *        src/include/access/brin.h
 */
#ifndef BRIN_H
#define BRIN_H

#include "fmgr.h"
#include "nodes/execnodes.h"
#include "utils/relcache.h"


/*
 * Storage type for BRIN's reloptions
 */
typedef struct BrinOptions
{
    int32        vl_len_;        /* varlena header (do not touch directly!) */
    BlockNumber pagesPerRange;
    bool        autosummarize;
} BrinOptions;


/*
 * BrinStatsData represents stats data for planner use
 */
typedef struct BrinStatsData
{
    BlockNumber pagesPerRange;
    BlockNumber revmapNumPages;
} BrinStatsData;


#define BRIN_DEFAULT_PAGES_PER_RANGE    128
#define BrinGetPagesPerRange(relation) \
    ((relation)->rd_options ? \
     ((BrinOptions *) (relation)->rd_options)->pagesPerRange : \
      BRIN_DEFAULT_PAGES_PER_RANGE)
#define BrinGetAutoSummarize(relation) \
    ((relation)->rd_options ? \
     ((BrinOptions *) (relation)->rd_options)->autosummarize : \
      false)


extern void brinGetStats(Relation index, BrinStatsData *stats);

#endif                            /* BRIN_H */
